SAP ABAP：如何获取select某个条件下的条目数

Posted 2021-02-28 SAP蛋妞 Daniel

       在ABAP中，有时候我们需要取某一条件下的条目数，要如何实现呢？

       这里有程咬金的三板斧：

（1）第一板斧：系统变量sy-dbcnt

 1   DATA: L_COUNT TYPE I.
 2   SELECT EQUI~EQUNR
 3          EQKT~EQKTX
 4          ILOA~SWERK
 5     INTO TABLE GT_EQUI
 6     FROM EQUI
 7     LEFT JOIN EQKT  ON  EQUI~EQUNR = EQKT~EQUNR  AND SPRAS = SY-LANGU
 8     LEFT JOIN EQUZ  ON  EQUI~EQUNR = EQUZ~EQUNR  AND EQUZ~DATBI = ‘99991231‘
 9     INNER JOIN ILOA  ON  EQUZ~ILOAN = ILOA~ILOAN
10     WHERE ILOA~SWERK IN S_SWERK
11     AND   EQUI~ERDAT IN S_ERDAT .
12 
13   IF SY-SUBRC = 0.
14     L_COUNT = SY-DBCNT.
15   ENDIF.

（2）第二板斧：select  count （*）

 1   DATA: L_COUNT TYPE I.
 2   SELECT COUNT( * )
 3     INTO  L_COUNT
 4     FROM EQUI
 5     LEFT JOIN EQKT  ON  EQUI~EQUNR = EQKT~EQUNR  AND SPRAS = SY-LANGU
 6     LEFT JOIN EQUZ  ON  EQUI~EQUNR = EQUZ~EQUNR  AND EQUZ~DATBI = ‘99991231‘
 7     INNER JOIN ILOA  ON  EQUZ~ILOAN = ILOA~ILOAN
 8     WHERE ILOA~SWERK IN S_SWERK
 9     AND   EQUI~ERDAT IN S_ERDAT .
10 
11   IF SY-SUBRC = 0.
12 
13   ENDIF.

（3）第三板斧：select  count （*）

 1   DATA: L_COUNT TYPE I.
 2   SELECT EQUI~EQUNR
 3          EQKT~EQKTX
 4          ILOA~SWERK
 5     INTO TABLE GT_EQUI
 6     FROM EQUI
 7     LEFT JOIN EQKT  ON  EQUI~EQUNR = EQKT~EQUNR  AND SPRAS = SY-LANGU
 8     LEFT JOIN EQUZ  ON  EQUI~EQUNR = EQUZ~EQUNR  AND EQUZ~DATBI = ‘99991231‘
 9     INNER JOIN ILOA  ON  EQUZ~ILOAN = ILOA~ILOAN
10     WHERE ILOA~SWERK IN S_SWERK
11     AND   EQUI~ERDAT IN S_ERDAT .
12 
13   IF SY-SUBRC = 0.
14 *    L_COUNT = SY-DBCNT.
15     DESCRIBE TABLE GT_EQUI LINES L_COUNT.
16   ENDIF.